1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Laws of Motion with Static Equilibrium

  1. Feb 12, 2010 #1
    1. The problem statement, all variables and given/known data
    Find θ and W in the figure below where w1 = 16.0 N, w2 = 25.0 N, and α = 66.5°, assuming that the arrangement is at rest.

    2. Relevant equations
    T_1=25/sin(alpha)
    F_x=-T_1cos(alpha)+T_2cos(theta)
    F_y=T_1sin(alpha)+T_2sin(theta)-2

    3. The attempt at a solution
    I tried to use the above equations to solve for the three unknowns. First I found the tension of the string on the left, then plugged that into the second two equations to find the remaining values and I could not get the correct answers.
     

    Attached Files:

  2. jcsd
  3. Feb 12, 2010 #2

    kuruman

    User Avatar
    Homework Helper
    Gold Member

    Why is this true? What are tensions T1 and T2 in each rope?
     
  4. Feb 12, 2010 #3
    Sorry I meant that it is 16/sin(alpha).
    This is because the vertical component of T_1 is 16 because of w_1. So using trig T_1=17.447. I am doing this the correct way and just making some kind of simple mistake?
     
  5. Feb 12, 2010 #4

    kuruman

    User Avatar
    Homework Helper
    Gold Member

    A pulley changes the direction of the tension without changing its magnitude. What is the tension in the piece of the leftmost rope that is hanging straight down?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook